koolcat
1 Answer
ROMOS
The acid is prepared industrially via a two step process. Hypophosphite salts of the alkali and alkaline earth metals result from treatment of white phosphorus with hot aqueous solution of the appropriate hydroxide, e.g. Ca(OH)2.
P4 + 3OH− + 3H2O → 3H2PO2− + PH3
The free acid may be prepared by the action of a strong acid on these hypophosphite salts.
H2PO2− + H+ → H3PO2
Alternatively, H3PO2 arises by the oxidation of phosphine with iodine in water.
PH3 + 2I2 + 2H2O → H3PO2 + 4I− + 4H+
HPA is usually supplied as a 50% aqueous solution.
Hope this helps.
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| 13 years ago. Rating: 5 | |
couldnt quite understand it.
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